Rationalize logging statements across codebase

This fixes up the following problems:
1. Using string concatenation instead of the formatting variant methods.
2. Logging or swallowing exception messages without logging the exception
   itself (this swallows the stack trace).
3. Unnecessary logging on re-thrown exceptions.
4. Unnecessary use of formatting variant methods when not necessary.
5. Complicated logging statements involving significant processing not being
   wrapped inside of a logging level check.
6. Redundant logging both of an exception itself and its message (this is
   unnecessary duplication).
7. Use of the base Logger class instead of our FormattingLogger class.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=182419837

java/google/registry/reporting/IcannReportingStagingAction.java

@@ -111,7 +111,7 @@ public final class IcannReportingStagingAction implements Runnable {
                 "ICANN Monthly report staging summary [FAILURE]",
                 String.format(
                     "Staging failed due to %s, check logs for more details.", thrown.toString()));
-            logger.severefmt("Staging action failed due to %s", thrown.toString());
+            logger.severe(thrown, "Staging action failed.");
             response.setStatus(SC_INTERNAL_SERVER_ERROR);
             response.setContentType(MediaType.PLAIN_TEXT_UTF_8);
             response.setPayload(String.format("Staging failed due to %s", thrown.toString()));

java/google/registry/reporting/IcannReportingUploadAction.java

@@ -95,7 +95,7 @@ public final class IcannReportingUploadAction implements Runnable {
                 },
                 IOException.class);
       } catch (RuntimeException e) {
-        logger.warningfmt("Upload to %s failed due to %s", gcsFilename.toString(), e.toString());
+        logger.warningfmt(e, "Upload to %s failed.", gcsFilename.toString());
       }
       reportSummaryBuilder.put(reportFilename, success);
     }

java/google/registry/reporting/ReportingEmailUtils.java

@@ -42,7 +42,7 @@ public class ReportingEmailUtils {
       msg.setText(body);
       emailService.sendMessage(msg);
     } catch (Exception e) {
-      logger.warningfmt("E-mail service failed due to %s", e.toString());
+      logger.warning(e, "E-mail service failed.");
     }
   }
 }